Chirping amp (please help!)

So I turn on my amp about 10 minutes ago and hear (to my dismay) a constant chirping sound. Basically it sounds like there's a bird stuck in my amp. When I turn the knobs to adjust the pickups, the peeping sound either gets faster or slower.

The amp is a Fender Bassman 25 and the bass is a Fender Deluxe Zone. This is the first time I have heard this sound.

I'm a beginner at playing and I know pretty much nothing about the technicalities of my bass, so this situation is kind of confusing (and not to mention a little scary) for me. The last thing i want to have to do is buy a new amp or bass.

my behringer 3000t head does it all the damn time and im just gonna get rid of it and buy a new ampeg head, but thats the easy way. another way is to turn down ur gain and adjust ur trebel and mids cuz usually ur cab cant handle the hrtz that ur head is producing. one way i got it to cut down was to buy a bass equalizer pedal. the boss bass equalizer is the best and u can cut ur frequencey through there and it should help a little. if all else fails get a new amp or cab.
ry

tweeter, maybe? i was getting a similar sound from my TNT... so tonight i took the tweeter out... problem solved.

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i'm guessing it's more of an electronics issue within the amp. The fact that it's occilating and that you can control the occilations with the knobs on the amp would point to a fault in the electronics.